dovecot - Jan 2010 - Fastest restart of dovecot after upgrade: HOW?:

I'm running dovecot under runit:

#!/bin/sh
echo '/var/core/%p' > /proc/sys/kernel/core_pattern
ulimit -n 8096
ulimit -c unlimited
exec /usr/local/sbin/dovecot -F

(that way, together with incron, I can automatically generate the
coredumps I'm posting all the time)

If I apply a patch and recompile, what is the fastest way of
restarting dovecot?

Which part of the process structure can be killed and takes all it's
children with it?

     ??runsvdir???runsv???ntpd
     ?          ??runsv???dovecot???2*[dovecot-auth]
     ?          ?       ?         ??1203*[imap]
     ?          ?       ?         ??64*[imap-login]
     ?          ?       ?         ??64*[managesieve-log]
     ?          ?       ?         ??64*[pop3-login]
     ?          ?       ??svlogd

killall dovecot?
Is that guaranteed to wipe out ALL child processes as well?

I had to use (at least in the past):

   sv d /var/service/dovecot
   killall dovecot
   killall -9 imap-login
   ps auxwww|grep dovecot

to make sure everything would be dead...

--
Ralf Hildebrandt
  Gesch?ftsbereich IT | Abteilung Netzwerk
  Charit? - Universit?tsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de

On 21.1.2010, at 16.35, Ralf Hildebrandt wrote:
> Which part of the process structure can be killed and takes all it's
> children with it?
> 
>     ??runsvdir???runsv???ntpd
>     ?          ??runsv???dovecot???2*[dovecot-auth]
>     ?          ?       ?         ??1203*[imap]
>     ?          ?       ?         ??64*[imap-login]
>     ?          ?       ?         ??64*[managesieve-log]
>     ?          ?       ?         ??64*[pop3-login]
>     ?          ?       ??svlogd
> 
> killall dovecot?
> Is that guaranteed to wipe out ALL child processes as well?
If you set shutdown_clients=yes. Although even with =no it should stop
listening.
> I had to use (at least in the past):
> 
>   sv d /var/service/dovecot
>   killall dovecot
>   killall -9 imap-login
>   ps auxwww|grep dovecot
> 
> to make sure everything would be dead...
I guess there can be bugs.. But in general the processes should notice
immediately that master died, and immediately close their listeners and
optionally shut down.